Lead pencil



Oct. 9, 1923.

' w. F. HAACK LEAD PENCIL v Filed Jan. 12, 1922 v' irli51511-111711viii INVENTOR. I M Z Jana; ATTORNEY Patented Oct; 9, 1923.

UNITED STATES PATENT OFFICE.

WILLIAM F. HAACK, OF BERWYN, ILLINOIS.

LEAD PENCIL.

Application filed January 12, 1922. Serial No. 528,601.

This invention relates to lead pencils ofthe magazme type, which contain a central chamber in which the working lead is held and through which it is advanced by a plunger or pusher as the point of the lead wears away, and a magazine containing additional leads which are successively supplied, as required, to the central chamber.

One object of the invention is to provide a pencil of this type wherein the reserve leads may be supplied to the central or working chamber by simple relative movement of parts of the pencil and without requiring preliminary separation of the parts in order to'introduce a reserve lead into the working chamber.

Another object of the invention is to provide a pencil of this character wherein the reserve leads "may be introduced to the working chamber from the magazine by first turning the working chamber relatively to the magazine to allowa lead to drop out of the latter and then tilting the pencil to approximately horizontal position to cause the lead to fall into the working chamber through a lateral slot in the latter.

A further object is to provide a pencil of this character with adiaphanous or translucent shell which makes the interior parts visible and thus facilitates the proper manipulation of the relatively movable parts to effect the transfer of the leads from the magazine to the working chamber.

- ther objects and attendant advantages of the invention will be apparent to persons skilled in the art as same becomes better understood by reference to the following detailed description, taken in connection with the accompanying drawing wherein I have illustrated one. practical and workable embodiment of the invention and in which,

- Fig. 1 is a longitudinal axial section, showing the plunger or pusher at its maximum point of advancement;

Fig. 2 is a view similar to Fig. 1, but showing the'plunger or pusher fully withdrawn, and oneof the reserve leads from the.

magazine, advancing into the working chamber;

Figs. '3, 4 and 5 are cross sections taken on the lines 33, 4- 4. and 5-5, respectively, of Fig. 1; and

Fig. 6 is a fragmentary longitudinal sec:

tion of the lower end of the working chamher, and the surrounding metal tip or ferrule, showing the position of the lead retainspring in the empty working chamber.

Tteferring to j the drawing, B designates the cylindrical-body or shell-of the pencil, which ismade of any suitable diaphanous or translucent material which will enable the interior arts to be observed through the same. lthin approximately the upper half of the shell B'is mounted a stationary compartmental magazine A, which may be conveniently formed by sheet metal bent into the corrugated cylindrical form illustrated relatively to the latter, and at its lower end I the magazine is stepped upon a valve disc Q, which latter is formed with a single ec'cen tric slot or hole Q. (Fig. 2) through which the leads C may drop, one at a time, out of the magazine.

Rotatably fitted on the lower end of the shell B is a metal ferrule E having a downwardly tapered lower portion, within the tip of which is secured by soldering or otherwise-the lower Bortion D of a longitudinally split tube which forms the working or propulsion chamber of the pencil. This working chamber may also be formed from a strip of sheet metal the inner and longer portion D being bent to a generally V-form, as best shown in Fig. 4, with its longitudinal margins folded inwardly, and the outer and single longitudinal slot. The working cham;

ber D is centered and held in proper relation to the shell by being attached at its upperend-to the discQ. and at its lower end to a similar disc G which fits within the fer-- rule E and lies against the lower end of the shell B.

Frictionally mounted on the lower portion D of the working chamber is a spring collar R, depending from which is a leaf spring R" that, when the working chamber is empty, springs through the narrow slot in the lower end ofithe latter and closes the same as clearly shown in Fig. 6. When,

- the latter at 0, and centered and supported however, the lead is forced downward through the working chamber, its point J forces the spring R outwardly, and the latter, by reason of its frictional grip or drag on the lead prevents the latter fromfalling out of the pencil.

H designates a plunger or pusher having at its upper end a short spiral H that cooperates with a tube K formed with an in-- ternal spiral or screw thread fitting spiral H of the plunger. The upper end of .the spiral tube K is united to a cap L sleeved on the body or shell B by being soldered to by a disc or spider M.

'lhc'cap L is longitudinally slitted at diametrically opposite points, as shown at L in Fig. 2, to permit its application and withdrawal.

Near 'its lower end the. plunger H is formedwith a pair of lateral lugs S (Figs.

2 and 4) which, by contact with the side walls of the working chamber D, holdthe plunger a ainst rotation on its longitudinal axis w en the cap L and spiral tube K are rotated to advance or retract the plunger.

7 The lower end of the plunger is also pro-- vided with a depending finger P which, after by turning the cap L, to the position shown in Fi 2', With the shell held in one hand nation of a diaphanous shell, an annular 105 chamber,

end strikes the upper end of the fragment and t e metal tip or ferrule Ein the other, these parts are relatively rotated until the hole or slot Q registers with the-lower end of a magazine chamber containing a reserve lead. W th the pencil held vertical, or sl ghtly tilted from vertical, the lead drops with its lower end entering the working as shown in Fig. 2, until its lower :of the previous lea with in the tip portion Di of the working chamber. By then tilting the pencil to approximately horizontal pos1t1on, the upper end of the into the central channel of the worhng chamber, whereupon the cap L is then turned to brmg'the plunger down onto the upper end of the new lead; with the-finger. lP. cc the latter against lateral displace ment. 7 e cap. L is then turned from time to tlme'to feed the new lead and the file ment of the previous lead forwardly as t e leads are gradually worn awayin um.

A leading advantage of my'presen't invention resides'in the translucent character of the shell, in combination with a worming ehambernnda magazine within the latter new lead drops- Leeefiao so co-ordinated and related that, under a relative turningmovement, a reserve lead can be fed from the magazine to the working chamber, the manipulation of theparts belng observable through the translucent shell. Manifestly the specific details herein shown and described for purposes of illustration may be variously modified without altering'the substantial character of the invention or sacrificing any of the advantages thereof. Hence, I reserve all such variations and modifications as fall within the spirit and purview of the appended claims.

I claimz:

1. In a magazine pencil, the combination of a diaphanous shell, a magazine for leads occupying approximately one longitudinal half of said shell, a working chamber coaxial with said shell and disposed within the other longitudinal'half of the latter and adapted to receive the leads successively from said magazine under a. relative rotary movement of said magazine and workin chamber, and a plun er for forcing the lea endwise' through sai working, chamber.

2. Inna magazine lead pencil, the combination of a 'diaphanous shell, a multi-cell magazine for leads 'mount'ed. within the upper portion of said shell, a working chamber coaxial with said shell beneath said magazine and rotatable relatively to the mar, said working chamber having a longitudinal slot for. the admission of a lead thereto, a valve carried by said workmg chamber and controlli g leads from said magagme, and a plunger for forcing the lead en'dwise through said working chamben,

3. In a magazine lead pencil, the comb1- multi-cell magazine for leads mounted within the upper mrtion of said shell, a working chamber coaxial with'said 'shellbeneath said magazine and rotatable relatively. to

the latter, said working chamber having a 11 longitudinalslot for the admission of a-lead thereto, a valve disc carried by said working chamber and controlling the discharge of leads from said magazine, and a plunger for torcingithe lead endwise through sard-work- 5 ing chamber, the forward end of said plunger having an ofisat depending ii r for retaining the upper'end of the lead in said working chamber.

a. In a magazinelead pencil, the combination Jot-a shell, an angular multicellmagazine for leads mounted within the upper portion of said shelL-a working chamher coaxial with said shell beneath said magazine and rotatable relatively to the latter,

' aid working chamber having a longitudinal slot forthe admimion of a lead thereto, a valve disc carried by said. worhng chamber and controlling the'discharge of leads from said magaine,-a plunger for forcing the lead p the-discharge of means endwise through said is working chamber,

said plunger having a spiral head, a rotatable tube mounted within said magazine and having an internal spiral engaged with the head of said lunger for advancing and retract' the atter, and means for locking said puunger against turning movement. 5.

a magazine lead pencil, the combination of a shell, a multi-cell magazine for leads mounted within the upper portion of said shell, a working chamber coaxial with said shell beneath said magazine and formed with a longitudinal slot for the admission of a lead'thereto, a ferrule rotatably mounted on the lower end of said shell and formed 1 with a pointed tip surrounding and attached I to the lower end of said working chamber,

nation of a shell, an annular multicell magazine for leads mounted within the upper portionof said shell,a working chamber coaxial with said shell beneath said magazine and formed with a longitudinal slot for the admission of a lead thereto, a ferrule rotatably mounted on the lower end of said shell and formed with a pointed tip surrounding-and attached to the lower end of said working chamber, a valve disc car ried by the upper end of said working chamber and controlling the discharge of leads from said magazine, a plunger for forcing the lead endwise through said workingchamber, said plunger having a spiral head, a tube mounted Within said magazine and having an internal spiral engaged with the head of said plunger for advancing and retracting the latter, a cap rotatably mounted on the upper end of said shell and attached to said tube, and means for locking said plunger against turnin movement.

WILL F. HAACK 

